If the Blues deal for a top(ish) D, they shouldn't deal any of their core players. They are one of the deepest teams in the league, and have a legit shot at the cup. Any trade should involve picks and prospects.. (and you guys have those too...)

St. Louis has to be one of the healthiest franchies in the league.
*Health measured in Team success, Star players, Depth, Prospect pool, Coaching.